[Bug dynamic-link/27279] x86_64 _dl_runtime_resolve should preserve r10

https://sourceware.org/bugzilla/show_bug.cgi?id=27279

Stefan Muenzel <source at s dot muenzel.net> changed:

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--- Comment #5 from Stefan Muenzel <source at s dot muenzel.net> ---
The x86-64 abi says in the footnote mentioning plt-use of r11 that r10 is used
for the static chain register (for passing the outer function context for
nested functions).

If I understand that correctly, this means that if r10 is not preserved, then
an inner function that is resolved via _dl_runtime_resolve will have its
context clobbered.

If this understanding is correct, then not preserving r10 is a bug w.r.t the
abi.

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